[PATCH] virtio-rng: block max-bytes=0

["Michael S. Tsirkin" <mst@redhat.com>]

with max-bytes set to 0, quota is 0 and so device does not work.
block this to avoid user confusion

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/virtio-rng.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index f74efffef7..7cf31da071 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -184,8 +184,9 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
 
     /* Workaround: Property parsing does not enforce unsigned integers,
      * So this is a hack to reject such numbers. */
-    if (vrng->conf.max_bytes > INT64_MAX) {
-        error_setg(errp, "'max-bytes' parameter must be non-negative, "
+    if (vrng->conf.max_bytes == 0 ||
+        vrng->conf.max_bytes > INT64_MAX) {
+        error_setg(errp, "'max-bytes' parameter must be positive, "
                    "and less than 2^63");
         return;
     }
-- 
MST